[jdk15u-dev] Integrated: 8256751: Incremental rebuild with precompiled header fails when touching a header file

[Yuri Nesterenko]

Let's try to file this PR _after_ (not yet integrated) PR for its right successor 8256810: hope it works. All patches apply clean, in the right order.

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Commit messages:
 - Backport 19b2898691f945f0d6257e88ec74e291d5d7f277

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/34/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=34&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256751
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/34.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/34/head:pull/34

PR: https://git.openjdk.java.net/jdk15u-dev/pull/34